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Ningxia University (2019)

Soil Material Deposition and Enrichment Characteristics of Three Clustered Plants in Degraded Desert Grassland

苗翻;

Titre : Soil Material Deposition and Enrichment Characteristics of Three Clustered Plants in Degraded Desert Grassland

Auteur : 苗翻;

Grade : Master’s Theses 2019

Université : Ningxia University

Résumé
Stipa breviflora,Oxytropis aciphylla Ledeb and Cynanchum komarovii Al.Iljinski are three common plants in degraded grassland of desert steppe,and can stably exist and maintain their grazing disturbance.The relative advantage of the population.These three types of clumps constitute the skeleton of such grassland communities,and are also the vegetation base for the relatively stable grassland under the disturbance of grazing.Soil is the basic factor determining the distribution pattern of plants.At the same time,plants also affect the distribution of soil.There is obvious mutual interaction between them.Shallow soil is the concentrated area and key area of interaction between plants and soil processes.The spatial distribution patterns of shallow soil sedimentation and enrichment in three small scales(inside and outside the plant)were studied,which contributed to the deep understanding of the stability mechanism of degraded grassland in desert steppe.In this study,the free grazing grassland was used as the object,and the fenced grassland was used as the control.The grain components of the three species of the plant,Stipa breviflora,cat head thorn,and old melon head(0-14 cm),were compared.).organic carbon(SOC)and total nitrogen(TN)deposition and enrichment distribution pattern.The main findings and conclusions are as follows:In terms of the whole soil layer,the encapsulation increased the soil clays of Stipa breviflora and Oxytropis aciphylla Ledeb by 16.69%and 46.33%,respectively,and the sand grains decreased significantly by 13.40%and 36.99%.and the particles decreased significantly by 3.50%and 9.34%.The SOC of P.stipitis was significantly increased by 0.57%(P<0.05),and the SOC was synchronous with the change of cosmid.The encapsulation did not significantly change the overall distribution pattern of soil particle composition,SOC and TN in the old melon head cluster(P>0.05).The grazing disturbance only significantly increased the enrichment rate "E" of the old melon head TN(P<0.05).2 cm fine stratification of soil material deposition,(1)The increase of mucilage in the enclosed area of Stipa breviflora,In the grazing area,the soil layer of 0-12cm is stable,the content of 12-14cm soil layer is significantly increased,and the sand envelope area decreases,and the grazing area increases and decreases,SOC 0-2cm soil surface polymorphism is prominent in the grazing area,and the presence of planting plexus under this condition is beneficial to increase the content of TN intermediate soil layer in planting plexus.(2)The change of soil layer did not affect the Oxytropis aciphylla Ledeb distribution of SOC and TN ;As the soil layer deepens,the depth of change of particle composition in the surrounding area is 0-6cm.and the grazing area is below 8cm,especially outside the vegetation ;SOC-table aggregation is prominent,and TN is prominent under grazing interference.(3)Enclosure significantly changed the distribution of soil clay and silt content in Lower Cynanchum komarovii Al.Iljinski soil layer,the clay content decreased significantly and the silt content increased significantly(P<0.05),and had no significant effect on soil sand,SOC and TN(P>0.05) ;with the deepening of the soil layer,the clay content increased continuously with the deepening of the soil layer,and the silt and sand showed a trend of continuous gradual decrease,and relative

Mots clés : Stipa breviflora; Oxytropis aciphylla Ledeb; Cynanchum komarovii Al.Iljinski; soil deposition; soil enrichment;

Présentation (CNKI)

Page publiée le 1er mai 2020